Port Gasket Matching

[eben80]

Evening guys. Has anyone done some exhaust manifold & head matching? The standard castings seem to have a lot of excess metal. The cast-iron elbows are surprisingly well matched to the gasket. I don't expect much but I suppose every little helps. Scribed the lines for the die-ginder.






Staying with the ports... should I be worried that the intake valve guides are protruding so far into the port? How would you normally cut them if you need to?

[bis13]

it seems the the blitz boys have been removing all that protrudes how true this is i cant confirm.   

[fightingtorque]

ideally you would remove the guides, get some new ones, turn them down in a lathe and then fit those. 

It could be A significant improvement at higher valve lifts. Removing the guides may be a specialist job though, probably need to heat the head plus have a press.

The best reference I am aware of for the theory and practice of cylinder head modification is david vizard's book 'tuning your a series engine' although he does also have an earlier book called 'theory and practice of.....'   
Even though it is about the a-series engine, it tells you what you would need to know to attack any kind of conventional tuning program, especially on a pushrod engine like the 126.

GAV